We have a similar problem with our 2012 Jazz. Last year the rear passenger door stopped locking on the fob so the hazards didn't flash and the alarm wasn't activated. Fix cost £290 at dealership. Now the front passenger door is doing the same. If we lock the door using the internal locking button the central works on the other doors. Unlocking is fine on the fob. Both fobs have good batteries. Is there a cheaper way of sorting out the problem.

Regarding the OP's boot not locking my Mk1 has the common problem where the handle to release the boot gets rusty and doesn't always return fully. That then means the boot won't lock or unlock with the remote. Just needs pushing into place. Can't recall if the Mk2 has the same problem but you could search the threads. Meanwhile thanks for reminding me mine needs lubricating again

Regarding the OP's boot not locking my Mk1 has the common problem where the handle to release the boot gets rusty and doesn't always return fully. That then means the boot won't lock or unlock with the remote. Just needs pushing into place. Can't recall if the Mk2 has the same problem but you could search the threads. Meanwhile thanks for reminding me mine needs lubricating again